LaF_3:Ce^(3+)纳米晶的制备及荧光性质

The Preparation of LaF_3∶Ce^(3+) Nanocrystals and Fluorescent Properties

采用水热法制备了掺杂Ce3+的LaF3的纳米粒子,分别用X射线粉末衍射(XRD)和荧光光谱(PL)对样品的结构和性质进行了表征。XRD的结果表明:LaF3∶Ce3+纳米晶标准卡为JCPDS73-2192,且颗粒平均尺寸为18.7nm,掺入Ce3+杂质后晶格结构没有变化。荧光光谱结果表明:Ce3+呈现其宽带发射,激发峰在245nm处,发射峰在444nm处,随着Ce3+的摩尔浓度比的增加,样品的荧光强度先增大后减小,且Ce3+的掺杂量为4%(摩尔比)时,纳米粒子的荧光强度最强,但更高的掺杂浓度将导致荧光猝灭。

The LaF3 ： Ce3＋ Nanocrystals were prepared using hydrothermal method, the structure and nature of the samples were characterized by X-ray powder diffraction （XRD） and fluorescence spectra, firstly, the prepared nanoparticles is LaFa ： Ce3＋ （JCPDS 73-2192）, the average size of the particles is 18.7nm and the lattice structure did not change after the incorporation of Ce3＋. secondly,the excitation peak is at 245nm and the emission peak is at 444nm. The fluorescent peak is from strong to weak with the increase of Ce3＋ concentration,moreover,when the doped Ce3＋ is 4 % （molar ratio）, the fluorescence intensity of the particles is the strongest, but a higher doping concentration will lead to fluorescent quenching.